You should be able to…(NOTE: Highlighted in red is KEY information that you should learn)

  • Describe the nature of the internet as a worldwide collection of computer networks
  • Describe the hardware needed to connect to the internet including modems, routers
  • Explain the need for IP addressing of resources on the internet and how this can be facilitated by the role of DNS services

-Every device on the internet has a unique IP address

-The address is broken down into four 8-bit numbers eg 202.168.0.12

DNS Servers DNS stands for “Domain Name System” and translates names to IP addresses, as it is much easier for people to remember names rather than a 12-digit number. When you type the domain name, “www.bbc.co.uk” into the browser a request is sent to a Domain Name System (DNS) server on the internet. The DNS server has a table of domain names linked to IP addresses so it can translate the domain name into an IP address. There are a large number of DNS servers in the internet and are regularly updated. If your local DNS server does not have the domain name listed, the request can be forwarded to another DNS. If the IP addresses change at some point the DNS servers can be updated. In most browsers you can also type the IP address of a site into the address bar to get to a site. The domain name and IP address both point to the same page.

  • Explain the importance of HTML and its derivatives as a standard for the creation of web pages
HTML = HyperText Mark-up Language
-Text file containing the text to be displayed
-It uses tags which indicate how to display pictures, hyperlinks to other locations/URLS etc
Why is it Important?
-Web browser interpret HTML files and display the data correctly
-It is an open/accepted standard so data will display correctly on all browsers which conform to the standard
  • Describe common file standards associated with the internet such as JPG, GIF, PDF, MP3, MPEG

JPG, GIF = Image file

PDF = Non-Editable documents

MP3 = Sound file

MPEG = Video file

  • Explain the importance of compressing files that are transmitted via the internet

-It reduces the size of the file which needs to be transmitted

-Shortens download time

-Reduces Internet traffic

-Allows multimedia files to be streamed

  • Describe the differences between lossy and lossless compression

-In lossy compression, when the data is uncompressed it is not exactly the same as the original but the difference is so small that it cannot normally be noticed Eg music files(mp3), large resolution images for displaying on small screens

-In lossless compression, when the data is uncompressed it is restored completely to the original file e.g. compressed text files

TOPIC OVERVIEW (Test your Knowledge)